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Electro-catalyst
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An electrocatalyst, electrocatalysis technology, applied in electrochemical generators, circuits, fuel cells, etc., can solve the problems of expensive, poor long-term stability, high overpotential and so on
Inactive Publication Date: 2012-02-08
MAGNETO SPECIAL ANODES
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However, they require higher overpotentials than e.g. Ru-based and Ir-based catalysts
On the other hand, Ru-based and Ir-based catalysts have the disadvantages of being expensive and poor long-term stability in alkaline media
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Embodiment 1
[0047] The catalyst was prepared by the general method disclosed in US4528084 and US4797182. According to these general methods, the support for the catalyst is degreased and etched with dilute acid. Then, a coating containing the desired metal salt or oxide is applied. The carrier is dried and heated in air at about 500°C. If the desired number of paint layers can be applied, they are then dried and heated.
[0048] The PtIr (70:30) catalyst was prepared as follows. The titanium sheet (160×30×1 mm) was degreased and etched (20% HCl, 90° C.), and then cleaned with deionized water. Apply H by coating 2 PtCl 6 and IrCl 3 of aqueous solution. Coating thickness is 5g / m 2 . The titanium sheet is then dried and heated at about 500°C.
[0049] The preparation of the TaIr catalyst is as follows. The titanium sheet (160×30×1 mm) was degreased and etched (20% HCl, 90° C.), and then cleaned with deionized water. Applied by coating with Ta(V) ethoxide and H 2 IrCl 6 organic ...
Embodiment 2
[0052] Cyclic voltammetry measurements were performed on the catalyst composition under the following conditions:
[0053] Electrolyte: H 2 SO 4 (25%w / w)
[0054] Potential: -300 / 1600mV
[0055] Scan speed: 5mV / s
[0056] Temperature: 25°C (in the oven)
[0057] Reference electrode: Ag / AgCl
[0058] Air Flow Through Electrolyte: Yes
[0059] In Table 1 the catalyst composition (on Ti support) and the results are shown.
[0060] Table 1
[0061]
Embodiment 3
[0063] In the cycle life test, at 2500A / m alternating as anode and cathode (reversing polarity every 5 minutes) 2 The Pt-Ir catalyst (70:30 weight ratio) and the Pt-Ir-V catalyst (69:29:2 weight ratio) on the Ti support were compared at the current density. Tested at 1mol / l Na 2 SO 4 carried out at 50°C.
[0064] Compared with Pt-Ir catalyst, Pt-Ir-V catalyst has higher activity in HER, HOR, ORR, OER (the cycle life of Pt-Ir-V is 1.06MAh / m 2 =102.3kAh / g.m 2 ); the cycle life of Pt-Ir is 0.86MAh / m 2 =80.7kAh / g.m 2 ). The result is as figure 1 and 2 shown. Therefore, the cycle life of Pt-Ir-V is increased by about 27% relative to Pt-Ir (102.3 / 80.7=1.27).
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Abstract
The present invention relates to an electro-catalyst, specificially to an electro-catalyst M'aIrbMc, wherein M' is selected from the group consisting of Pt, Ta and Ru, and wherein the molar ratio a : b is within the range of 85 : 15 to 50 : 50 and the molar ratio a : c is within the range of 50 : 50 to 95 : 5, both calculated as pure metal and wherein M is selected from metals from Groups 3-15 of the Periodic System of Elements. The present invention further relates to an electrode comprising a support and the electro-catalyst. The present invention further relates to the use of the electro-catalyst and / or the electrode in electrochemical processes which comprise an oxygen reduction reaction (ORR), an oxygen evolution reaction (OER), a hydrogen evolution reaction (HER), a hydrogen oxidation reaction (HOR), a carbon monoxide oxidation reaction (COR) or a methanol oxidation reaction (MOR).
Description
Summary of the invention [0001] The present invention relates to an electrocatalyst comprising a first metal selected from Pt, Ta and Ru, a second metal being Ir, and a third metal. The invention also relates to the use of electrodes containing the catalyst and the use of said electrodes in electrocatalytic processes. In particular, the electrocatalyst can serve as a dual-functional air electrode for oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, hydrogen oxidation reaction, carbon monoxide oxidation reaction, and methanol oxidation reaction. Background technique [0002] The use of metal-based catalysts in electrocatalytic processes is well known in the prior art. For example, hydrogen / air fuel cells generate electricity by converting fuel, usually hydrogen. Conventionally, such fuel cells contain membranes such as Nafion ) separated by two half-cells, where hydrogen is oxidized at the anode (usually a Pt-based anode), the correspondi...
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